???? Treathay 120mg Hay Fever Relief Tablets | Fexofenadine Hydrochloride | Non-Drowsy 24 Hour Allergy Relief. Donot take if you are allergic to fexofenadine or any ingredient. Each tablet containsFexofenadine Hydrochloride 120mg, a modernnon-drowsy antihistamine that starts working in around1 hour and provides effective relief for up to24 hours.